I have recently been experiencing playback glitches that I can't trace. Sometimes, but not always, in a current pieces I am working on, the orchestra cellos will play back a whole step too low. I have been having the same issue with a chamber piece and the playback of a harp part. I am not using the pitch wheel on these pieces, nor am I using any transposition tricks.
This is a new problem and I am at a loss as to what may be causing it. As far as I can tell I don't have any odd controller information being sent. I have thought it might be a MIDI cable not fully seated in its connector, or perhaps one of my MIDI interfaces is going bad (yes, I know, a very old style setup).
I have also tried deleting the orchestra cello part within MIR Pro, and recreating the matrix from scratch. That has seemingly made no difference. I have also tried reassigning a different MIDI channel for the part, and that seems to help.
Any other ideas of what might be going wrong? Am I likely on the right track thinking it could be MIDI interface related?
Thanks for your ideas.